tests: added check to verify that the server will bail out after many alerts

2 files changed, 225 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6cf4a2dab2..50884c7bc6 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -113,7 +113,8 @@ ctests = mini-record-2 simple gc set_pkcs12_cred certder certuniqueid	\
 	 safe-renegotiation/srn3 safe-renegotiation/srn4 safe-renegotiation/srn5 \
 	 rsa-illegal-import set_x509_key_file_ocsp_multi set_key set_x509_key_file_ocsp_multi2 \
 	 set_key_utf8 set_x509_key_utf8 insecure_key handshake-large-packet \
-	 client_dsa_key server_ecdsa_key tls-session-ext-register tls-session-supplemental
+	 client_dsa_key server_ecdsa_key tls-session-ext-register tls-session-supplemental \
+	 multi-alerts
 
 if HAVE_SECCOMP_TESTS
 ctests += dtls-with-seccomp tls-with-seccomp dtls-client-with-seccomp tls-client-with-seccomp
diff --git a/tests/multi-alerts.c b/tests/multi-alerts.c
new file mode 100644
index 0000000000..15065475dc
--- /dev/null
+++ b/tests/multi-alerts.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2016 Red Hat, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuTLS is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GnuTLS; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* In this test we check whether the server will bail out after receiving
+ * a bunch of warning alerts. That is to avoid DoS due to the assymetry of
+ * cost of sending an alert vs the cost of receiving.
+ */
+
+#if defined(_WIN32)
+
+/* socketpair isn't supported on Win32. */
+int main(int argc, char **argv)
+{
+	exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#if !defined(_WIN32)
+#include <sys/wait.h>
+#endif
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+
+#include "utils.h"
+#include "cert-common.h"
+
+pid_t child;
+
+static void tls_log_func(int level, const char *str)
+{
+	fprintf(stderr, "%s |<%d>| %s", child ? "server" : "client", level,
+		str);
+}
+
+static unsigned char tls_hello[] =
+	"\x16\x03\x01\x01\x38\x01\x00\x01"
+	"\x34\x03\x03\xfc\x77\xa8\xc7\x46"
+	"\xf7\xfd\x04\x5b\x3c\xc6\xfa\xa4"
+	"\xea\x3e\xfa\x76\x99\xfe\x1a\x2e"
+	"\xe0\x79\x17\xb2\x27\x06\xc4\x5c"
+	"\xd8\x78\x31\x00\x00\xb6\xc0\x30"
+	"\xc0\x2c\xc0\x28\xc0\x24\xc0\x14"
+	"\xc0\x0a\x00\xa5\x00\xa3\x00\xa1"
+	"\x00\x9f\x00\x6b\x00\x6a\x00\x69"
+	"\x00\x68\x00\x39\x00\x38\x00\x37"
+	"\x00\x36\x00\x88\x00\x87\x00\x86"
+	"\x00\x85\xc0\x32\xc0\x2e\xc0\x2a"
+	"\xc0\x26\xc0\x0f\xc0\x05\x00\x9d"
+	"\x00\x3d\x00\x35\x00\x84\xc0\x2f"
+	"\xc0\x2b\xc0\x27\xc0\x23\xc0\x13"
+	"\xc0\x09\x00\xa4\x00\xa2\x00\xa0"
+	"\x00\x9e\x00\x67\x00\x40\x00\x3f"
+	"\x00\x3e\x00\x33\x00\x32\x00\x31"
+	"\x00\x30\x00\x9a\x00\x99\x00\x98"
+	"\x00\x97\x00\x45\x00\x44\x00\x43"
+	"\x00\x42\xc0\x31\xc0\x2d\xc0\x29"
+	"\xc0\x25\xc0\x0e\xc0\x04\x00\x9c"
+	"\x00\x3c\x00\x2f\x00\x96\x00\x41"
+	"\x00\x07\xc0\x11\xc0\x07\xc0\x0c"
+	"\xc0\x02\x00\x05\x00\x04\xc0\x12"
+	"\xc0\x08\x00\x16\x00\x13\x00\x10"
+	"\x00\x0d\xc0\x0d\xc0\x03\x00\x0a"
+	"\x00\x15\x00\x12\x00\x0f\x00\x0c"
+	"\x00\x09\x00\xff\x01\x00\x00\x55"
+	"\x00\x0b\x00\x04\x03\x00\x01\x02"
+	"\x00\x0a\x00\x1c\x00\x1a\x00\x17"
+	"\x00\x19\x00\x1c\x00\x1b\x00\x18"
+	"\x00\x1a\x00\x16\x00\x0e\x00\x0d"
+	"\x00\x0b\x00\x0c\x00\x09\x00\x0a"
+	"\x00\x23\x00\x00\x00\x0d\x00\x20"
+	"\x00\x1e\x06\x01\x06\x02\x06\x03"
+	"\x05\x01\x05\x02\x05\x03\x04\x01"
+	"\x04\x02\x04\x03\x03\x01\x03\x02"
+	"\x03\x03\x02\x01\x02\x02\x02\x03"
+	"\x00\x0f\x00\x01\x01";
+
+static unsigned char tls_alert[] = 
+	"\x15\x03\x03\x00\x02\x00\x0A";
+
+static void client(int sd)
+{
+	char buf[1024];
+	int ret;
+	unsigned i;
+
+	/* send a TLS hello, and then a list of warning alerts */
+
+	ret = send(sd, tls_hello, sizeof(tls_hello)-1, 0);
+	if (ret < 0)
+		fail("error sending hello\n");
+
+	ret = recv(sd, buf, sizeof(buf), 0);
+	if (ret < 0)
+		fail("error receiving hello\n");
+
+	for (i=0;i<128;i++) {
+		ret = send(sd, tls_alert, sizeof(tls_alert)-1, 0);
+		if (ret < 0)
+			fail("error sending hello\n");
+	}
+
+	close(sd);
+}
+
+static void server(int sd)
+{
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+	int ret;
+	unsigned loops;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+
+	gnutls_global_set_log_function(tls_log_func);
+	if (debug)
+		gnutls_global_set_log_level(6);
+
+	gnutls_certificate_allocate_credentials(&x509_cred);
+	gnutls_certificate_set_x509_trust_mem(x509_cred, &ca3_cert,
+					      GNUTLS_X509_FMT_PEM);
+
+	gnutls_certificate_set_x509_key_mem(x509_cred, &server_ca3_localhost_cert,
+					    &server_ca3_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	if (debug)
+		success("Launched, generating DH parameters...\n");
+
+	gnutls_init(&session, GNUTLS_SERVER);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	gnutls_priority_set_direct(session, "NORMAL", NULL);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	gnutls_transport_set_int(session, sd);
+	loops = 0;
+	do {
+		ret = gnutls_handshake(session);
+		loops++;
+		if (loops > 64)
+			fail("Too many loops in the handshake!\n");
+	} while (ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_WARNING_ALERT_RECEIVED);
+
+	if (ret >= 0) {
+		fail("server: Handshake succeeded unexpectedly\n");
+	}
+
+	close(sd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+
+void doit(void)
+{
+	int sockets[2];
+	int err;
+
+	err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
+	if (err == -1) {
+		perror("socketpair");
+		fail("socketpair failed\n");
+		return;
+	}
+
+	child = fork();
+	if (child < 0) {
+		perror("fork");
+		fail("fork");
+		return;
+	}
+
+	if (child) {
+		int status;
+
+		server(sockets[0]);
+		wait(&status);
+	} else
+		client(sockets[1]);
+}
+
+#endif				/* _WIN32 */